Fig. 3
From: Oldest preserved umbilical scar reveals dinosaurs had ‘belly buttons’
Variation in umbilical scarring in extant lizards. Uninterrupted abdominal scales with no umbilical scarring in (A). The blue-tongued lizard (Tiliqua scincoides) and B the land mullet (Bellatorias major). Poorly demarcated umbilicus (endpoints indicated by arrowheads) without distinctive paired scales in (C). The bearded dragon (Pogona barbata) and D the eastern water dragon (Amphibolurus barbartus). Anterior is up in all images. Scale bar increments in centimetres